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Abstract

We demonstrate that our previous loss results [1] in an all-solid photonic bandgap fiber were in fact limited by bend loss. A new design, based on the addition of an extra ring of air holes on the outside of the all-solid photonic bandgap structure, is then proposed, realized and characterized. We demonstrate that it significantly reduces both the fiber diameter and its sensitivity to bend loss.

Fig. 3. Theoretical plot of the bandgaps (white). For simplicity, the silica refractive index is kept constant and equal to 1.45 (upper blue curve). Also shown the fundamental space filling mode of the air clad (nFSM, lower blue curve) and the effective index of the fundamental core mode in the 3rd and 4th bandgap (dark lines).

Fig. 5. (a) Transmission spectrum of the DC PBGF through 460 m (blue) and 10 m (red) with the bandgap number. (c) and (d) are the mode profiles observed at 1150 nm for respectively L = 10 m and L = 460 m. e) and g) are the mode profiles observed for L = 460 m at respectively 1190 et 1500 nm. Note that if (d) and (e) show all the solid microstructured cladding, (c) and (g) are zoomed on the core mode, whereas (b) and (f) are zooms on few doped rods respectively at 950 and 1190 nm.

Fig. 6. Loss spectra of the DC PBGF obtained by the cut back technique for bend radius of 15.8 cm (dark blue curve) and 7.9 cm (dark green curve). The red circle points out an artifact due to the existence of extra confined modes. The corresponding spectra for the all-solid PBGF are represented in bright colors.

Fig. 7. Transmission spectra of the all-solid PBGF (a) and of the DC PBGF (b) for different bend radii: 6 cm (pink), 4.5 cm (yellow), 3.75 cm (cyan) and 3 cm (purple). For each of these spectra 10 turns of the fiber were wrapped on a mandrel of the corresponding radius. The dark blue curves, referred as ‘straight fiber’, were obtained for 3 very large loops of diameter higher than 35 cm.